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1、keil
2、STM32CubeMX
3、正点原子STM32F407探索者开发板
1、配置RCC外部晶振和SYS为SW模式(看之前配置方式)
2、配置USART1(调试使用)
3、时钟树配置,SDIO模块输入时钟为48MHZ
4,、SDIO配置
SDIO时钟SDIO_CK = 48MHz/(CLKDIV+2)。即12MHZ
打开SDIO中断
添加DMA
5、配置Fatfs文件系统
支持中文及长文件名
使用DMA模板
SD卡插入检测引脚,探索版不带此功能,引脚这边必须配置一个引脚,否则生成文件会报错,任意设置一引脚使用,生成工程后注释代码
配置检测引脚
6、配置NVIC
SDIO中断优先级必须大于DMA
7、生成代码配置,必须加大堆栈内存,否则可能不够
8、生成代码
1、打开bsp_driver_sd.c文件,修改__weak uint8_t BSP_SD_IsDetected(void)如下
原因:探索者开发板没有SD卡检测引脚
2、修改usart.c,添加如下代码
3、修改主函数测试代码
添加变量
#define u8 uint8_t
#define u16 uint16_t
#define u32 uint32_t
FATFS fs;
FIL fil;
uint32_t total,mfree; // file objects
uint32_t byteswritten; /* File write counts */
uint32_t bytesread; /* File read counts */
uint8_t wtext[] = "This is STM32 working with FatFs"; /* File write buffer */
uint8_t rtext[100]; /* File read buffers */
char filename[] = "STM32cube.txt";
添加测试代码
u8 exf_getfree(u8 *drv,u32 *total,u32 *free) { FATFS *fs1; u8 res; u32 fre_clust=0, fre_sect=0, tot_sect=0; res =(u32)f_getfree((const TCHAR*)drv, (DWORD*)&fre_clust, &fs1); if(res==0) { tot_sect=(fs1->n_fatent-2)*fs1->csize; fre_sect=fre_clust*fs1->csize; #if _MAX_SS!=512 tot_sect*=fs1->ssize/512; fre_sect*=fs1->ssize/512; #endif *total=tot_sect>>1; *free=fre_sect>>1; } return res; } void Fatfs_RW_test(void) { printf("\r\n ****** FatFs Example ******\r\n\r\n"); /*##-1- Register the file system object to the FatFs module ##############*/ retSD = f_mount(&fs, "0", 1); //f_mkdir("0:dxc"); if(retSD) { printf(" mount error : %d \r\n",retSD); Error_Handler(); } else printf(" mount sucess!!! \r\n"); /*##-2- Create and Open new text file objects with write access ######*/ retSD=exf_getfree("0:",&total,&mfree); if(retSD==0) printf(" total : %d MB,free : %d MB \r\n",total>>10,mfree>>10); else printf(" getfree error!!! \r\n"); retSD = f_open(&fil, filename, FA_CREATE_ALWAYS | FA_WRITE); if(retSD) printf(" open file error : %d\r\n",retSD); else printf(" open file sucess!!! \r\n"); /*##-3- Write data to the text files ###############################*/ retSD = f_write(&fil, wtext, sizeof(wtext), (void *)&byteswritten); if(retSD) printf(" write file error : %d\r\n",retSD); else { printf(" write file sucess!!! \r\n"); printf(" write Data : %s\r\n",wtext); } /*##-4- Close the open text files ################################*/ retSD = f_close(&fil); if(retSD) printf(" close error : %d\r\n",retSD); else printf(" close sucess!!! \r\n"); /*##-5- Open the text files object with read access ##############*/ retSD = f_open(&fil, filename, FA_READ); if(retSD) printf(" open file error : %d\r\n",retSD); else printf(" open file sucess!!! \r\n"); /*##-6- Read data from the text files ##########################*/ retSD = f_read(&fil, rtext, sizeof(rtext), (UINT*)&bytesread); if(retSD) printf(" read error!!! %d\r\n",retSD); else { printf(" read sucess!!! \r\n"); printf(" read Data : %s\r\n",rtext); } /*##-7- Close the open text files ############################*/ retSD = f_close(&fil); if(retSD) printf(" close error!!! %d\r\n",retSD); else printf(" close sucess!!! \r\n"); /*##-8- Compare read data with the expected data ############*/ if(bytesread == byteswritten) { printf(" FatFs is working well!!!\r\n"); } }
main函数添加代码
成功
注:测试代码为网上复制
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